Add check for quantile range

Signed-off-by: Palash Nigam <[email protected]>

Author: palash25

src/metrics/summary.rs

@@ -57,6 +57,10 @@ impl Summary {
         let stream_duration = Duration::from_secs(max_age_seconds / max_age_buckets);
         let last_rotated_timestamp = Instant::now();
 
+        if target_quantile.iter().any(|&x| x > 1.0 || x < 0.0) {
+            panic!("Quantile value out of range");
+        }
+
         Summary{
             max_age_buckets,
             max_age_seconds,
@@ -128,7 +132,7 @@ mod tests {
     use super::*;
 
     #[test]
-    fn basic() {
+    fn summary() {
         let summary = Summary::new(5, 10, vec![0.5, 0.9, 0.99], 0.01);
         summary.observe(1.0);
         summary.observe(5.0);
@@ -139,4 +143,10 @@ mod tests {
         assert_eq!(3, c);
         assert_eq!(vec![(0.5, 5.0), (0.9, 10.0), (0.99, 10.0)], q);
     }
+
+    #[test]
+    #[should_panic(expected="Quantile value out of range")]
+    fn summary_panic() {
+        Summary::new(5, 10, vec![1.0, 5.0, 9.0], 0.01);
+    }
 }